Xyzal (levocetirizine) is an antihistamine that reduces the effects of natural chemical histamine in the body.
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Zyrtec is also used to treat itching and swelling caused by chronic urticaria (hives). Zyrtec may also be used for purposes not listed in this medication guide.
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Atarax is used as a sedative to treat anxiety and tension. It is also used together with other medications given for anesthesia.
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These chemicals cause swelling in your lungs and tightening of the muscles around your airways, which can result in asthma symptoms.
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